Global Patent Index - EP 0426023 B1

EP 0426023 B1 19950308 - Process for removing chloroprene dimers from polychloroprene.

Title (en)

Process for removing chloroprene dimers from polychloroprene.

Title (de)

Verfahren zur Entfernung von Dimeren von Chloropren aus Polychloropren.

Title (fr)

Procédé pour éliminer des dimères de chloroprène de polychloroprène.

Publication

EP 0426023 B1 19950308 (EN)

Application

EP 90120555 A 19901026

Priority

US 42957789 A 19891031

Abstract (en)

[origin: EP0426023A1] Removing chloroprene dimers from polychloroprene by feeding to a screw extruder a polychloroprene latex and coagulating the latex in the extruder, feeding the coagulated latex to a dewatering zone and discharging the coagulated polychloroprene through a flow restriction which heats and pressurizes the polychloroprene to an area of reduced pressure to form a porous crumb. Also, the flow restriction applies back pressure sufficient that the water in the polychloroprene is forced out of a vent port. The polychloroprene crumb discharged from the extruder is heated to strip chloroprene dimer therefrom.

IPC 1-7

C08C 1/14; C08C 3/00; B29C 47/60

IPC 8 full level

B29B 7/84 (2006.01); B29B 13/00 (2006.01); B29B 13/02 (2006.01); B29B 15/00 (2006.01); B29C 48/04 (2019.01); B29C 48/395 (2019.01); B29C 48/53 (2019.01); B29C 48/535 (2019.01); B29C 48/55 (2019.01); B29C 48/76 (2019.01); C08C 1/14 (2006.01); C08C 3/00 (2006.01); C08J 9/28 (2006.01); B29C 48/08 (2019.01); B29K 9/00 (2006.01)

CPC (source: EP US)

B29C 48/04 (2019.01 - EP US); B29C 48/395 (2019.01 - EP US); B29C 48/53 (2019.01 - EP US); B29C 48/535 (2019.01 - EP US); B29C 48/55 (2019.01 - EP US); B29C 48/76 (2019.01 - EP US); B29C 48/919 (2019.01 - EP US); C08C 1/14 (2013.01 - EP US); C08C 3/00 (2013.01 - EP US); B29C 48/08 (2019.01 - EP US)

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

US 4943402 A 19900724; CN 1044100 C 19990714; CN 1051364 A 19910515; DE 69017587 D1 19950413; DE 69017587 T2 19950817; EP 0426023 A1 19910508; EP 0426023 B1 19950308; JP H03203609 A 19910905; JP H0733020 B2 19950412

DOCDB simple family (application)

US 42957789 A 19891031; CN 90108890 A 19901031; DE 69017587 T 19901026; EP 90120555 A 19901026; JP 29513690 A 19901031